@article{PORMA_1953__12_3_114717,
     author = {Conkling, Randall and Ellis, David},
     title = {On metric groupoids and their completions},
     journal = {Portugaliae mathematica},
     pages = {99--103},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1953},
     mrnumber = {0060524},
     zbl = {0051.25301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1953__12_3_114717/}
}